Calculating-machine.



F. TRINKS.

CALCULATING MACHINE.

APPLICATION FILED SEPT-23. 1915.

"8 29 x 977/ 9 z' I" 5 z, AE

2222346 66 5 7/6 Z ZU6iZZ07 A Z7" aka I Wave rnsnz TRINKS, or nnunswxcx, GERMANY.

CALGULAT ING-MACI'IINE.

Specification of Letters Patent.

Patented Mar. 20, 1917.

Application filed September as, 1915. Serial No. 521512.

to c

' type wherein shiftable teeth are carried by calculating wheels mounted on. a

shaft and wherein manually operated setting rings serve,'when actuated, to

pro""* the necessary number of teeth of .culating wheels with which they are respe ively associated in order, when said crank shaft is actuated, to rotate registering-drums to the numbers to be indicated.

The object of my invention is to provide means for locking the crank shaft against movement where any of the setting rings has not assumed its exactposition, and thus prevent a wrong number of teeth from being projected from the calculating wheel and a false calculating operation from being carried out.

Referring to the accompanying draw- :ings, wherein the preferred embodiment of wmy invention is represented Figure 1 is an elevation, partly in section of a calculating wheel, set-ring, crank shaft and. the device for coupling same with a concentric shaftj Fi g. 2 is a longitudinal stgctiOn of part of a calculating machine sho ing the locking device, one of the calcula ingwheels and its set-ring being shown in elevation;

3 is a detail; I I (it; l is a side view of the lockingde- Lig. 5 is a view similar to Fig. l and snoring a modification. a is the hollow crank shaft, 1) is the crank hollow shaft. 6, l) are loose teeth arranged on said wheel and provided with projections it fitting into a common segmental. groove y of a set-ring e mounted on said wheel. The segmental groove is composed oftwo parts of approximately equal length, one part being nearer the center of l the rin than the other part. The ring a it. is provided with a handlelc which projects My invention relates to calculating ma nes and more especially to machines of handle in gear with it, and a is one of a plurality of calculating wheels fixed on said,

through a slot in the casing surrounding the machine whereby the ring may be set by hand. The ring is provided on its interior with a row of notches d and a spring-actuated pawl 0 arranged Within'a radial bore in the calculating wheel a opposite said notches will enter any oneof said notches and thus cause the ring .2 to assume an exact position.

The calculating wheel, when the crank shaft n is rotated also rotates a registering drum is according to the number of teeth which project from the calculating wheel and which engage teeth on a wheel 75 formed as a part of or secured to said drum.

Now it may happen that the set-ring 2, after having been turned by hand, does not assumea position to project the loose teeth 6 far enough to engage the teeth of the wheel z' with which they are in gear, the pawl e being thus revented from entering one of the notches on ring a. In order to avoid a false calculating operation which would necessarily result from such inaccuracy of position, it has been proposed to so look the crank shaft against rotation whenever such inaccuracy occurs. This has been efi'ected by providing a pin a: at the rear end of pawl e and a corresponding perforation f in the hollow crank shaft and in a fixed bar carrying said shaft, the pawl e on leaving one of the notches, d forcing the pin a: into said perforations and thus coking the shaft, until the pawl has entered another notch of the set ring z, thus withdrawing .90 the locking pin from the shaft. and bar. When the pawl e is in a position between two notches the shaft 42 is locked against r0- tation and no calculating operation can be 1 carried out.

However, such a locking device as that described has the disadvantage that the relatively weak locking pin is subjected to all of the stress exerted upon the crank handle when it is attempted to turn the shaft while 10 i in locked position. In order to relieve the pin of this stress and to prevent it from. being broken, I replace the fixed bar which carries the hollow crank shaft by a rock shaft 9 adapted to be rocked by the hollow 10 crank shaft whenever said shafts are coupled by means of in w. A ratchet disk u, provided with teet t to. form a notch u" is fixed on the hollow shaft. The inner or rock shaft 9 is provided at one end with a slotted 1 centric shafts;

latter.

crank arm 0, and a short counter shaft on parallel to shaft 9 carries another crank arm Q provided with a pin j) which pro jects into the slot of crank arm 0. A double acting cam Z is fixed to counter shaft m be low ratchet dish a, and a double acting" pawl s pivoted to a pin r is pressed down upon the upper, face of said cam by a spring to.

The operation of this locking device is as follows: In the case mentioned above, where the set-ring .2 after having been turned has not assumed an exact position, the pawl 6 being thus prevented from entering one of the notches (Z, the lock pin w is held back in the perforations of shafts a and 9, thus coupling both shafts and causing hollow shaft a, when the handle a is actuated, to rotate along with it. This movement causes crank arm 0 of the shaft to oscillate crank arm g and counter shaft m carrying the The cam Z on shaft on will now lift pawl 3, against the action of spring to, into notch a of lock disk u, thus locking the crank shaft xv against further movement until the coupling between it and shaft 9 has been released by bringing disk 2 into a position where pawl 0 can enter one of the notches (Z, to withdraw the coupling pin :0 from the depression in shaft 9 which is then caused to return to its initial position by means of the spring to acting upon the pawl s acting through. it upon the cam Z, shaft m and crank arms Q and 0.

it is to be understood that I do not limit myself to-the enact form. of coupling, looking and driving elements described above but It reserve the rightto make such changes and variations in the construction as properly fall within the scope of the appended claims. Thus the teeth t instead of being arranged on a separate ratchet dish might form part of one of the wheels a fixed on shaft n, as shown in Fig. 5.

ll claim i. in a calculating machine, a pair of zonshiftable number-operating means carried by one of said shafts; means for shifting said number operating means into and out of operative position; means carried by one of said shafts for arresting said shifting means in set position and adapted, when said shifting means is not in proper position, to couple said shafts; and means operable h v'one of said shafts when said shafts are coupled and given an initial movement to lock the other shaft igai' st rotation 2. lo a calculating machine, a pair of con centric shafts; shiftable number-operating means carried by one of said shafts; means for shifting said number operating means into and out of operative position; a detent carried by one ofsaid shafts to arrest saic shifting means in set position andservagainst movement intense associated with said numbenoperating means to shift the latter into and out of operative position; means actuated by said shifting means for coupling said shafts whenever said shifting means has assumed an intermediate position; a pawl adapted L .1. 1 1L t0 engage and loch said rotatable shait and means associated with said rock shaft for moving said into engagement with said rotatable shaft said shafts when said shafts are coupled and are initially rocked.

in a calculating machine, centric shafts; shifta-bie number means carried by the outer shalt T shifting said. number operating in i and out of operative position tuatcd by said shifting means for est said shafts whenever said shifting has assumed an intermediate pawl movable into and out of engagement with said outer shaft; cam associat v said pawl; and means associated wi inner shaft for actuating said and ing said pawl into H outer shaft whenever the s J and the outer shaft i 5. in a calculating nacli I centric shafts; shi' i means carried by one or its for shifting said numb into and out of operat actuated pawl carri to engage and arr means in set pa l t the other a v not in arresting pi ition; and

able by said latter shaft for first-named shaft i said shafts are coupled and in" H5 8. In calculating machine, a rotatable shaft and a rock-shaft mounted in concentric relation; shiftable number one means carried b vflsaid i rings as ociated wi said for shift saul niunber-i'i each having spring actiu to. table shaft adapted to ente v and adapted to engage said roclr. sliai couple said shafts whenever said 7 ue not entered one of said notches; 9am mor able into engagem with rotatable shaft to lock same r0 ion; a cam. 1

for actuating" pawl;

eiated with the rock shaft for actuating the my hand in presence of two subscribing cam and thereby moving said pawl into en- Witnesses.

gagement with said rotatable shaft when FRANZ TRINKS. said shafts are coupled and the rotatable \Vitnesses: 5 shaft is given an initial movement. RICHARD KiiLBs,

-In testimony whereof I have hereunto set EUGENE C. HARTER. 

